这是我前不久遇到的一个问题，使用Windows的API函数RasEnumConnections检测RAS连接时，每个操作系统版本都必须提供不一样的RASCONN结构体，而我这个程序又必须能够运行在任何的Windows版本下，所以试着写了一个类模板。。。。（初学新手，有什么问题望各位大侠指正）
/* 文件：RasDetectT.h
* 功能：检测、断开RAS连接 * 作者：shootingstars （zhouhuis22 at sina.com.cn） * 日期：2004-11-4 20:18 * 使用例子： * CRasDetect *obj = CRasDetect::GetInstance(); * obj->EnumConnections(); * obj->HangupAll(); 
*/ 
/* 结构体定义 * 针对Windows的各个版本，定义不同的RASCONN结构体 */struct RASCONNWXP //for WinXP/2003{
DWORD dwSize; HRASCONN hrasconn; CHAR szEntryName[ RAS_MaxEntryName + 1 ]; CHAR szDeviceType[ RAS_MaxDeviceType + 1 ]; CHAR szDeviceName[ RAS_MaxDeviceName + 1 ]; CHAR szPhonebook [ MAX_PATH ]; DWORD dwSubEntry; GUID guidEntry; DWORD dwFlags; LUID luid;};struct RASCONN2000 //for Win2000{ DWORD dwSize; HRASCONN hrasconn; CHAR szEntryName[ RAS_MaxEntryName + 1 ]; CHAR szDeviceType[ RAS_MaxDeviceType + 1 ]; CHAR szDeviceName[ RAS_MaxDeviceName + 1 ]; CHAR szPhonebook [ MAX_PATH ]; DWORD dwSubEntry; GUID guidEntry;};struct RASCONNNT4 //for WinNT4{ DWORD dwSize; HRASCONN hrasconn; CHAR szEntryName[ RAS_MaxEntryName + 1 ]; CHAR szDeviceType[ RAS_MaxDeviceType + 1 ]; CHAR szDeviceName[ RAS_MaxDeviceName + 1 ]; CHAR szPhonebook [ MAX_PATH ]; DWORD dwSubEntry;};struct RASCONNW9X //for Win98/95{ DWORD dwSize; HRASCONN hrasconn; CHAR szEntryName [ RAS_MaxEntryName + 1 ]; CHAR szDeviceType[ RAS_MaxDeviceType + 1 ]; CHAR szDeviceName[ RAS_MaxDeviceName + 1 ];}; /* * 客户使用接口 */class CRasDetect{public: virtual bool EnumConnections() = 0; // 枚举所有RAS连接 virtual bool HangupAll() = 0; // 断开所有RAS连接 virtual bool Hangup(int index) = 0; // 断开某个（index）RAS连接 static CRasDetect *GetInstance(); // 返回特定操作系统版本的CRasDetectT对象（Singleton模式，不支持多线程）private: static CRasDetect *Instance;};CRasDetect *CRasDetect::Instance = NULL; template <class RASCONNT>class CRasDetectT : public CRasDetect{public: CRasDetectT(); ~CRasDetectT(); bool EnumConnections(); bool HangupAll(); bool Hangup(int index);protected: RASCONNT *m_lprasconn; DWORD m_connectionCount; // 枚举获得的连接数目 DWORD m_structSize; // 当前系统RASCONN结构体的大小}; template <class RASCONNT>CRasDetectT<RASCONNT>::CRasDetectT(){ m_structSize = sizeof(RASCONNT);} template <class RASCONNT>CRasDetectT<RASCONNT>::~CRasDetectT(){} template <class RASCONNT>bool CRasDetectT<RASCONNT>::EnumConnections(){ m_lprasconn = (RASCONNT *)new BYTE[m_structSize]; DWORD dwCb; dwCb = m_structSize; m_lprasconn->dwSize = m_structSize; DWORD dwErr = RasEnumConnections( (RASCONN*)m_lprasconn, &dwCb, &m_connectionCount); if (ERROR_BUFFER_TOO_SMALL == dwErr)
{
delete m_lprasconn; m_lprasconn = (RASCONNT *)new BYTE[m_structSize]; m_lprasconn->dwSize = m_structSize; dwErr = RasEnumConnections( (RASCONN*)m_lprasconn, &dwCb, &m_connectionCount); if(dwErr == ERROR_SUCCESS) return true; else return false;
} else if(dwErr == ERROR_SUCCESS) return true; else return false;} template <class RASCONNT>bool CRasDetectT<RASCONNT>::Hangup(int index){ DWORD err = RasHangUp(m_lprasconn[index].hrasconn); if(err == 0) return true; else return false;} template <class RASCONNT>bool CRasDetectT<RASCONNT>::HangupAll(){ bool result = true; for(DWORD i = 0 ; i < m_connectionCount ; i++) if(!Hangup(i)) result = false; return result;} // 返回当前操作系统的CRasDetectT对象CRasDetect* CRasDetect::GetInstance(){ if(Instance) return Instance; OSVERSIONINFOEX osvi; BOOL bOsVersionInfoEx; ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) ) { osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO); if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) ) return NULL; } switch(osvi.dwPlatformId) { case VER_PLATFORM_WIN32_WINDOWS: // Win95/Win98 return new CRasDetectT<RASCONNW9X>; case VER_PLATFORM_WIN32_NT: if(osvi.dwMajorVersion>=5) // Windows 2000( NT5.0 ) { if(osvi.dwMinorVersion >= 1) { return new CRasDetectT<RASCONNWXP>; } else { return new CRasDetectT<RASCONN2000>; } } else // NT 4.0 { return new CRasDetectT<RASCONNNT4>; } break; } return NULL;}
